Concentrated solar technology is expected to contribute significantly to a future sustainable, efficient, and diverse energy mix. Together with suitable thermal energy storage systems, concentrated solar energy may provide base load power. Moreover, concentrated solar energy can be used for high-temperature process technology, e.g., for the production of fuels or chemicals. Material requirements in the field of concentrated solar energy are manifold: Besides thermal and thermomechanical stability, lifetime, and environmental resistance, appropriate functional properties (optical, chemical, and thermal) also must be taken into account.